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A high-power V-band relativistic orotron on a TM03 oscillation mode has an ovesized (D/k 2.7) electrodynamic structure and diffractive output in the TM02 mode [3]. Single-mode operation of the oscillator is ensured by the cyclotron selection of the working axisymmetric mode, with simultaneous depression of competing non-axisymmetric modes by means of cutting longitudinal slits in the wall of the SWS. The output power is 350 MW with a power conversion efficiency of 31% when using a 3.6 kA, 310 keV electron beam transported in the 3.9 T magnetic field. The modeling demonstrated that the simultaneous application of cyclotron and electrodynamic methods of mode selection in the orotron ensures the single-mode operation of the oscillator. The simulated microwave efficiency of the device is close to the theoretical limit. Furthermore, the orotron retains its efficiency 30% even in the case when the energy of the driving electron beam is reduced to 200 keV. Therefore, it seems to be possible to build a compact pulsed source of millimeter-wave radiation with a power of about 10 W, based on an orotron and a compact high-current electron accelerator.

Code KARAT in simulations of power microwave sources including Cherenkov plasma devices, vircators, orotron, E-field sensor, calorimeter etc.